How long should you leave hair dye in before rinsing? 30 or 45 minutes

woman dyes her hair brown at home

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  • In order to find out how long you should leave permanent hair dye in your hair before rinsing, you should keep two things in mind: the color you’re going to use and why you’re using the dye.
  • If you choose a light color or you want to change colors, you should leave the permanent dye in for 45 minutes. If you’re dyeing your hair a dark color, you can leave the dye in for 30 minutes.
  • If you’re touching up your roots, leave the dye in for 30 minutes, and if you want to touch up the same color or it’s the first time you’re dyeing your hair, it’s best to leave the dye in for 45 minutes.

 

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How long to leave hair dye on roots? It depends on the color

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As you can see,  you should leave permanent dye in your hair between 30 and 45 minutes.  That means exactly how long depends on what color you choose and the kind of color job you’re doing on your hair.

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Because  touching up your roots isn’t the same as touching up your entire head of hair. 

 

Keeping these two things in mind, it’s very important to leave the dye in your hair for the right amount of time to avoid damaging it.

Because permanent dye contains chemicals like ammonia and hydrogen peroxide that can dry your hair out if you leave them in your hair for longer than necessary.

 

remove artificial color and lighten bleached hair

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So, what would happen if you use the permanent dye in your hair to touch up your roots and you leave it in your hair for less than 30 minutes (the recommended amount of time in this case)?

Your roots would likely end up lighter than you want because the pigments weren’t able to penetrate into your hair to change its color. Your roots might even end up looking blotchy.

 

And what would happen if you want to touch up your whole head and you leave the dye in for two hours instead of the 45 minutes you were supposed to?

What would happen is that when you go to rinse out the dye, you won’t be able to detangle your hair because it will have lost both moisture and nutrients, making it dried out and weak.

 

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So,  don’t make the mistake of first using the dye and then reading the instructions about how long you should leave it in for. 

Coloring your hair is a form of chemical processing that can ruin your hair. So, before you begin, you should know exactly how long you should leave the dye in before rinsing it.

Let’s start by talking about why you’re dyeing your hair because how long you should leave the dye in your hair will depend on that.

 

If you’re touching up your color or dyeing your hair for the first time, you should leave the dye in for 45 minutes

How long does permanent dye last on bleached hair

I’ll start by addressing those who are going to dye their hair for the first time.

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I want to be clear with you: I know that because of the amount of information out there online, box dyeing your hair seem easy, so easy a kid could do it with their eyes closed.

But don’t be tricked by all the information about there. The only little box that contains easy happiness is the one that the famous hamburgers come in.

 

A color kit has some advantages because you can dye your hair from the comfort of your own home and it’s cheaper than dyeing your hair in a salon.

But, if it’s the first time you’re going to dye your hair, I’ll give you two pieces of advice:

  • Keep in mind how many boxes of dye you’ll need based on your hair length.
  •  Stick to leaving the dye in your hair for the recommended amount of time. 

 

Which I can assure you is 45 minutes.

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Because even though virgin hair is more sensitive to chemical processing, the dye will take some time to penetrate into your hair to change the color than if you’d dyed your hair before.

 Once you finish using the dye from your roots to your ends, you should leave it in for 45 minutes before rinsing. 

 

And if you want to touch up your color because it’s lost its intensity, you should also leave the permanent dye in for 45 minutes.

Because even though your hair color was modified before with another dye, the cuticles are more rigid and because of that, the pigments will take longer to enter inside your hair.

 

Now let’s get to the second thing you need to keep in mind when calculating how long you should leave permanent dye in your hair. And that second thing is the color dye you’re going to use.

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Why?

 

The darker the dye, the less time you should leave it in your hair

woman applying box dye to her brown hair

Because using a level 1 black dye is not the same as using a level 6 dark blonde or lightest platinum blonde 10.

 You always leave lighter colored dyes in for longer so your hair can absorb the color correctly because the pigments are weaker. 

 

I’ll give you an example that doesn’t have anything to do with your hair so you can see what I mean.

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If you want to paint a green wall, what color would you use to cover it faster? Black or white?

Of course, you’d choose black.

 

The same concept applies to hair dyes.  Darker colors have stronger pigments that take less time to deposit in your hair/ 

So, tell me what color you’re going to dye your hair and I’ll tell you how long to leave the dye in.

  •  If you’re going to dye your hair with blonde 7, light blonde 8, lighter blonde 9 or lightest blonde 10 , leave the dye in for 45 minutes.
  •  If you’re going to dye your hair with a dark blonde 6, light brown 5 or brown 4, leave it in for 30-45 minutes.
  •  If you’re going to dye your hair with a dark brown 3 , black 1 or red, leave it in for 30 minutes.

 

Now you know how long you should leave permanent dye in your hair.

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But remember that permanent dye only lightens your hair up to two levels. So, if you have dark hair and you want to use a blonde dye, you need to bleach your hair first.

And since bleaching your hair is a very aggressive chemical process, it’s best to speak with a professional hair colorist to avoid damaging your hair.

 

Conclusion

To find out how long you should leave permanent dye in your hair, you should always keep in mind the color you’re going to use and why you’re dyeing your hair.

Because for example, to touch up your roots, you should always leave the dye in less time than if you want to touch up your whole head.

You should also keep in mind the maximum amount of time you should leave a permanent dye in for is 45 minutes. If you leave it in for longer, it will damage your hair.

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